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Home My WebLink AboutAgenda Report - June 19, 2019 C-13AGENDA ITEM c-t3 Crrv or Loor CouNcrr-, CovTMUNICATIoN IM AGENDA TITLE: MEETING DATE: PREPARED BY: Adopt Resolution Authorizing City Manager to Execute Change Order No. 2 ($43,048) for Granular Activated Carbon Replacement, Well No. 4R and Well No. 22 June 19, 2019 Public Works Director RECOMMENDED ACTION Adopt resolution authorizing City Manager to execute Change Order No. 2, in the amount of $43,048, for Granular Activated Carbon Replacement, Well No. 4R and Well No. 22. BACKGROUND INFORMATION: The granular activated carbon (GAC) replacement project forWell 4R and Well 22was awarded to Calgon Carbon Corporation on February 6,2019, in the amount of $230,222, and authorized the City Manager to execute change orders in an amount not-to-exceed $50,000. The GAC was removed and the carbon vessels were inspected by the contractor. The contractor's inspection reports (Exhibit A) indicated that vessels on both well sites have interior corrosion and defects which need to be repaired prior to filling them with new GAC. Staff reviewed the reports and concurs with the recommendations. Change Order No. 1, in the amount of $28,699, was executed by the City Manager on June 6, 2019, and included the cost to perform repairs on two vessels at Well No. 22. Proposed Change Order No. 2, in the amount of $43,048, includes the repair of three vessels at Well No. 4R. lf Change Order No. 2 is approved, the total change order amount of $71 ,747 exceeds the City Managers authority of $50,000 requiring this Council action. ln comparison, the cost to replace five new GAC vessels would be approximately $1,000,000. Staff recommends authorizing City Manager to execute Change Order No. 2, in the amount of $43,048, for Granular Activated Carbon Replacement, Well No. 4R and Well No. 22. FISCAL IMPACT:Funds for this project will be coming from the Water Utility Fund's DBCP Operations and Maintenance account, which is funded under the terms of the DBCP settlement. This project will not impact the General Fund. APPROVED S KIWP\PROJ ECTS\WATER\GAC4 R22\C_ChangeOrder. doc r, City Manager 8t6t2019 Adopt Resolution Authorizing C¡ty Manager to Execute Change Order No. 2 ($43,048) for Granular Activated Carbon Replacement, Well No. 4R and Well No. 22 June 1 9, 201 I Page2 FUNDING AVAILABLE: Water Capital (56199000.77020) - $43,000 Andrew Keys Deputy City Manager/lnternal Services Director Charles E. Swimley Jr Public Works Director Prepared by Lyman Chang, City Engineer/Deputy Public Works Director cEs/Lc/tdb Attachments Cc: Utility Superintendent Calgon Carbon Corporation Rebecca Areida-Yadav/Management Analyst Construction Manager Senior Civil Engineer, Nathan \ K:\WP\P ROJ ECTS\WATER\GAC4R22\C_Changeorder.doc 61612019 MECHANICAL INTEGRITY COATING ASSESSMENT REPORT Client Name: Calgon Carbon Corporation Facility/ Location: Well R44, Lodi Ca. Equipment Description: Pressure Vessels A, B & C Client Representative: Mark Bailey 4/30/2019 Prepared by: 5351 Olive Drive, Suite 100 Bakersfield, California 93308 190446 2 DAILY WORK LOG DPSI was onsite to perform an Internal Coating Assessment on pressure vessels A, B, & C at Well R44 located in Lodi, CA. on 4/30/19. Upon completion of this assessment, the following findings were noted: Vessel A: Existing coating is in good serviceable condition on bottom head, shell and top head, where visible (limited access). Repair patches appear to be adherent to the existing coating and are also in good serviceable condition. Top head manway and nozzle has carbon build-up which appears to be causing coating failure and signs of corrosion. Light carbon build-up on manway seems to be causing coating failure and surface rust. Bottom nozzle and filter have heavy carbon build-up with signs of coating failure. Bottom hatch was not open for inspection of the outer bottom head. Dry Film Thickness (DFT) averages are 20-40 mils. Estimated square footage of repair: 5 sq. ft. Vessel B: Existing coating is in good serviceable condition throughout vessel, top head where visible (limited access). Repair patch on bottom nozzle is adherent to the existing coating and is in good serviceable condition However, has carbon build-up and should be monitored for coating failure and possibly corrosion. Sample olet and top manway cover have minor carbon present with signs of coating failure and possibly corrosion. Isolated coating failure was found around manway caused by carbon build-up as well. Bottom hatch was not open for inspection of the outer bottom head. DFT averages were found to be in the 20-40 mil range as well. Estimated square footage of repair: 2 sq. ft. Vessel C: Existing coating is in good serviceable condition on bottom head, shell and top head, where visible (limited access). Repair patches appear to be adherent to the existing coating and are also in good serviceable condition. Excessive carbon build-up found on top manway cover, nozzles, and sample olets possibly causing coating failure and corrosion. Coating failure found on bottom of manway caused by carbon build-up seems to be reaching the substrate. Carbon build-up is also present around bottom nozzle and filter with early signs of coating failure. Bottom nozzle interior seems to have exposed substrate possibly caused by abrasive blasting ricochet from previous repair work with surface rust forming at the weld. If left exposed, corrosion can take place. Bottom hatch was not open for inspection of the outer bottom head. DFT averages were found to be in 25 -50 mil range. Estimated square footage of repair: 5 sq. ft. Recommendations for all vessels: It is recommended to repair areas with carbon build-up in all vessels causing coating failure by removing existing coating, inspect areas for corrosion, repair as needed, and recoat. It is also recommended to apply protective coating to the interior of bottom nozzle in vessel C to prevent potential corrosion. Also, areas with Carbon build-up should be cleaned thoroughly to inspect for coating failure and/or corrosion. *NOTE: DSPI recommends that repair work be performed by abrasive blasting to remove existing coating down to substrate to produce specified anchor profile and recoat with a compatible coating. *Repair footage is just an estimate. Some areas with heavy carbon build up will need to be cleaned to determine if additional repair work will be needed. ______________ John Martinez NACE Coating Inspector Level-2 Certified # 53263 SSPC PCS Certified # 2018-113-309 190446 3 PHOTOGRAPHS VESSEL A OVERVIEW OVERVIEW OF TOP HEAD OVERVIEW OF SHELL OVERVIEW OF BOTTOM HEAD OVERVIEW OF SAMPLE OLETS REPAIR COATING ON SAMPLE OLET 190446 4 PHOTOGRAPHS VESSEL A OVERVIEW OF BOTTOM NOZZLE CARBON BUILD-UP WITH POSSIBLE COATING FAILURE ON BOTTOM NOZZLE REPAIR COATING ON BOTTOM NOZZLE CARBON BUILD-UP AROUND BOTTOM FILTER POTENTIAL COATING FAILURE EXISTING COATING OVERVIEW MANWAY COVER 190446 5 PHOTOGRAPHS VESSEL B OVERVIEW OF VESSEL B OVERVIEW OF TOP HEAD OVERVIEW OF SHELL / SAMPLE OLETS OVERVIEW OF SHELL / EXISTING COATING OVERVIEW OF BOTTOM HEAD / FILTERS OVERVIEW OF SAMPLE OLET 190446 6 PHOTOGRAPHS VESSEL B CARBON BUILD-UP AROUND TOP MANWAY COVER CARBON BUILD-UP AROUND SAMPLE OLET WITH SIGNS OF COATING FAILURE CARBON BUILD-UP ISOLATED AREAS CARBON BUILD-UP AROUND MANWAY OVERVIEW OF BOTTOM NOZZLE CARBON BUILD-UP AROUND BOTTOM NOZZLE 190446 7 PHOTOGRAPHS VESSEL C OVERVIEW OF VESSEL C OVERVIEW OF TOP HEAD OVERVIEW OF SHELL OVERVIEW OF BOTTOM FILTERS OVERVIEW OF SAMPLE OLETS COATING FAILURE AROUND BOTTOM SAMPLE OLET 190446 8 PHOTOGRAPHS VESSEL C CLOSE UP OF COATING FAILURE ON SAMPLE OLET COATING FAILURE AROUND MANWAY DOWN TO SUBSTRATE CARBON BUILD-UP AROUND TOP MANWAT COVER AND NOZZLES CARBON BUILD-UP AROUND BOTTOM NOZZLE CARBON BUILD-UP AROUND BOTTOM FILTER BARE METAL ON INTERIOR OF BOTTOM NOZZLE CAUSING SURFACE RUST MECHANICAL INTEGRITY COATING ASSESSMENT REPORT Client Name: Calgon Carbon Corporation Facility/ Location: Well 22, Lodi Ca. Equipment Description: Pressure Vessels A & B Client Representative: Mark Bailey 4/30/2019 Prepared by: 5351 Olive Drive, Suite 100 Bakersfield, California 93308 190446 2 DAILY WORK LOG DPSI was onsite to perform an Internal Coating Assessment on pressure vessels A & B at Well 22 located in Lodi, CA. on 4/30/19. Upon completion of the assessment the following findings were noted: Vessel A: Existing coating is in good serviceable condition on bottom head, shell and top head, where visible (limited access). However, repair patches are present and have osmotic blistering (coating failure). Repair patches also found on top head, but cannot determine the condition due to limited access. Surface rust on manway cover found and can lead to possible corrosion. Areas with carbon build-up are also causing coating failure and signs of corrosion to the substrate. These areas include around bottom filter (2nd from bottom on NE), around bottom nozzle, sample olets, around top hatch, top nozzles, and manway. Dry Film Thickness (DFT) averages are 20-50 mils. Estimated square footage of repair: 15 sq. ft. Vessel B: Existing coating is in good serviceable condition on bottom head and shell and top head, where visible (limited access). Repair patches also present and are in good serviceable condition as well. However, areas with carbon build-up have coating failure with signs of corrosion to the substrate. These areas are located around manway, top hatch, and top two sample olets. An area with possibly abrasives imbedded in the coating was also noted, which can cause future coating failure/corrosion. The bottom hatch was also open for inspection which exposes outside of bottom head. DPSI inspected (where visible due to limited entry) and found the same conditions. Carbon build-up causing possible coating failure and signs of corrosion. Repair patches also seemed to be in good serviceable condition. DFT averages were found to be in the 20-40 range. It was noted that possible leaks were located on an external olet as well as bottom inlet of vessel which is an area of concern and should be monitored. Estimated square footage of repair: 10 sq. ft. Recommendations: Vessel A: It is recommended to repair existing patches with blistering by removing existing coating, prep areas and recoat. It is also recommended to repair areas with carbon build-up causing coating failure by removing existing coating, inspect areas for corrosion, repair as needed, and recoat. Vessel B: It is recommended to repair areas with carbon build-up causing coating failure by removing existing coating, inspect areas for corrosion, repair as needed, and recoat. It is also recommended that the areas of concern which could be possible leaks on the external, should be monitored and repaired as needed. *NOTE: DSPI recommends that repair work be performed by abrasive blasting to remove existing coating down to substrate to produce specified anchor profile and recoat with a compatible coating. *Repair footage is just an estimate. Some areas with heavy carbon build up will need to be cleaned to determine if additional repair work will be needed. ______________ John Martinez NACE Coating Inspector Level-2 Certified # 53263 SSPC PCS Certified # 2018-113-309 190446 3 PHOTOGRAPHS VESSEL A OVERVIEW OVERVIEW OF TOP HEAD OVERVIEW OF BOTTOM/FILTERS OSMOTIC BLISTERING OSMOTIC BLISTERING SHELL OVERVIEW/SAMPLE OLETS 190446 4 PHOTOGRAPHS VESSEL A CARBON BUILD-UP CARBON BUILD-UP CAUSING COATING FAILURE WITH SIGNS OF CORROSION CARBON BUILD-UP CAUSING COATING FAILURE WITH SIGNS OF CORROSION MANWAY CARBON BUILD-UP POSSIBLE CORROSION ON SAMPLE OLET MANWAY COVER 190446 5 PHOTOGRAPHS VESSEL B OVERVIEW OF VESSEL B OVERVIEW OF TOP HEAD OVERVIEW OF BOTTOM/FILTERS CARBON BUILD-UP AROUND SAMPLE OLET CARBON BUILD-UP CAUSING COATING FAILURE WITH SIGNS OF CORROSION POSSIBLE IMBEDDED ABRASIVES IN COATING 190446 6 PHOTOGRAPHS VESSEL B COATING FAILURE AROUND MANWAY COATING FAILURE AROUND MANWAY CARBON BUILD-UP CARBON BUILD-UP OVERVIEW OF OUTSIDE BOTTOM HEAD POSSIBLE LEAK ON EXTERNAL OLET (AREA OF CONCERN) RESOLUTTON NO. 2019-102 A RESOLUTION OF THE LODI CITY COUNCIL AUTHORIZING THE CITY MANAGER TO EXECUTE CHANGE ORDER NO, 2 FOR GRANULAR ACTIVATED CARBON REPLACEMENT, WELL NO. 4R AND WELL NO. 22 WHEREAS, the Granular Activated Carbon Replacement Project for Well 4R and Well22 was awarded to Calgon Carbon Corporation on February 6, 2019, in the amount of $230,222, and Council further authorized the City Manager to execute change orders in an amount not to exceed $50,000; and WHEREAS, Change Order No. 1, in the amount of $28,699, was executed by the City Manager on June 6,2Q19, and included the cost to perform repairs on two vessels at Well No. 22, and WHEREAS, staff recommends authorizing the City Manager to execute Change Order No. 2 for Granular Activated Carbon Replacement, Well No. 4R and Well No. 22, in the amount of $43,048, for repair of interior corrosion and defects. NOW, THEREFORE, BE lT RESOLVED that the Lodi City Council does hereby authorize the City Manager to execute Change Order No. 2 for Granular Activated Carbon Replacement, Well No. 4R and Well No. 22, in the amount of $43,048. Dated: June '19, 2019 I hereby certify that Resolution No. 2019-102 was passed and adopted by the City Council of the City of Lodi in a regular meeting held June 19,2019, by the following vote: AYES: COUNCIL MEMBERS - Johnson, Kuehne, Mounce, and Nakanishi NOES: COUNCIL MEMBERS - None ABSENT: COUNCIL MEMBERS - Mayor Chandler ABSTAIN: COUNCIL MEMBERS - None NIFER FERRAIOLO City Clerk 2019-102